Error loading Serilog from IConfiguration in Azure Function

Question

I'm getting the following error when trying to setup Serilog from IConfiguration in an Azure Function.

Could not load file or assembly 'Microsoft.Extensions.DependencyModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

The error is thrown at runtime on the line:

var loggerConfiguration = new LoggerConfiguration().ReadFrom.Configuration(Configuration);

My Startup class looks like below:

public class Startup : FunctionsStartup
{
    public IConfiguration Configuration { get; set; }

    public override void Configure(IFunctionsHostBuilder builder)
    {
        Configuration = builder.GetContext().Configuration;

        (...)

        var loggerConfiguration = new LoggerConfiguration().ReadFrom.Configuration(Configuration);

        var logger = loggerConfiguration.CreateLogger();
        builder.Services.AddLogging(lb => lb.AddSerilog(logger));
    }
}

I can see the Microsoft.Extensions.DependencyModel(3.0.0) dependency in my project's dependencies, as a child dependency of Serilog.Settings.Configuration(3.3.0).

I can hard code the Serilog configuration, and have this working for example with a MSSqlServer sink, but the point is to have this configurable through a simple settings change.

I'm using .net6 and azure functions v4.

Edit: adding .csproj sample

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.ServiceBus" Version="5.1.0" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.0.1" />
    <PackageReference Include="Serilog.Settings.Configuration" Version="3.3.0" />
    <PackageReference Include="Serilog.Sinks.MSSqlServer" Version="5.6.1" />
  </ItemGroup>
(...)

Usings in Startup.cs:

using Microsoft.Azure.WebJobs;
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Serilog;
using System.Reflection;
using Microsoft.Extensions.Logging;
(...)
Other project references and company libs
(...)

could you please share the `.csproj` code to see the dependencies, packages version installed and the namespaces using in function class like `using system` etc? — , Nov 27 '21 at 02:43
I have the exact same scenario and the exact same issue on my end as well... Have somebody found a solution for this? It's really weird since everything matches most of the documentation that can be found about this. — CesarD, Jan 21 '22 at 17:52

score 3 · Answer 1 · answered Jan 27 '22 at 23:47

3

I've run into this, and found that if I keep the Microsoft.NET.Sdk.Functions dependency on 3.0.03, it works fine, even using .net6 and Azure Functions V4.

<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.03" />

answered Jan 27 '22 at 23:47

Ben

2,962
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20
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score 3 · Answer 2 · answered May 25 '22 at 05:01

Found an alternative solution in another thread.

Set _FunctionsSkipCleanOutput to true in the project.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <Nullable>enable</Nullable>
    <SatelliteResourceLanguages>en-US</SatelliteResourceLanguages>
    <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput>
  </PropertyGroup>

With this, you can use the latest SDK

<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.1.0" />

Happy logging !

score 0 · Answer 3 · answered Mar 31 '23 at 06:48

0

Similar to the anser of @Alex Monkey is to only skipping a particular DLL. Like so:

<ItemGroup>
    <FunctionsPreservedDependencies Include="Microsoft.Extensions.DependencyModel.dll" />
</ItemGroup>

Source reference here

answered Mar 31 '23 at 06:48

LockTar

5,364
3
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Error loading Serilog from IConfiguration in Azure Function

3 Answers3